One of the main problems on Air Fin Coolers is the Header bending, caused by the tightening of the bolts on the flange Headers; because of that, the thermofluid-dynamic efficiency of the equipment is compromised.
Gasket for AirCoolers
Air Fin Coolers header bending solution
In fact, this bending header deformation allows the fluid erroneously to go through the header groove and not through the inner finned tubes (see picture), finally not being cooled for the process.
Furthermore, this fluid passage could start erosion phenomena damaging pass-rib and header, increasing the quantity of fluid moving in the other wrong area of the equipment.
Another risk is the mass flow rate loss inside finned tubes with consequently increasing drop pressure caused by inner dirtiness lay down.
Moreover, if bolts load is limited to avoid the Header bending, then it could happen to have not the correct pressure along the gasket seat with consequent fluid leaks.
Material structure with the puzzle system
- VED’s Research&Development Division has found the solution to the above issues by using a MI5 gasket material that assures the sealing at low loads in order to not incur into Header deformation bending.
- By cutting from a sheets layer, this gaskets are made in sectors, with puzzle junctions; easy to handle, all the complete long gasket will be mounted directly on the flange seat, jointing all the pieces between themselves by a double graphite coverjoint placed over the junctions.